在
中,
,以
为直径的圆交
于
,交
于
.过点
的切线交
的延长线于
.求证:
是
的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2020/4/21/2446230915850240/2446512796598272/STEM/444b5052fe134c56932dfbdb06151c23.png?resizew=128)
2019·四川凉山·模拟预测 查看更多[3]
2019年四川省凉山州九年级中考适应性数学试题(已下线)专题3.29 《圆》中的切线证明专题(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(北师大版)(已下线)2022年四川省凉山州中考数学真题变式题21-28题
更新时间:2020-04-21 23:05:56
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知在
中,
,点D为AB的中点,点P在线段BC上由B点向C点运动,同时,点Q在线段CA上由点C向点A运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/89bdbc5d-71e9-479a-b9ee-39388a455513.png?resizew=128)
(1)如果点P、Q的速度均为3厘米/秒,经过1秒后,
与
是否全等?请说明理由;
(2)若点P的运动速度为2厘米/秒,点Q的运动速度为2.5厘米/秒,是否存在某一个时刻,使得
与
全等?如果存在请求出这一时刻并证明;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ef7e75e075e8ec83be363eac1be219.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/89bdbc5d-71e9-479a-b9ee-39388a455513.png?resizew=128)
(1)如果点P、Q的速度均为3厘米/秒,经过1秒后,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a411048182ab68fa4b834e1ce3bb1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2afff3cdf17337893d776f9d4aea43c0.png)
(2)若点P的运动速度为2厘米/秒,点Q的运动速度为2.5厘米/秒,是否存在某一个时刻,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a411048182ab68fa4b834e1ce3bb1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2afff3cdf17337893d776f9d4aea43c0.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图所示,在菱形ABCD中,AB=6,∠B=60°,点E、F分别是边BC、CD上的两个动点,E点从点B向点C运动,F点从点D向点C运动,设点E、F运动的路径长分别是a和b.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/b964d5a4-8567-4330-a3ac-f536dee88577.png?resizew=483)
(1)猜想:如图①,当a=b时,写出线段AE与线段AF的数量关系;
(2)证明:如图②,连接AC,若a+b=6,请证明△ABE≌△ACF;
(3)应用:在(2)的条件下,四边形AECF的面积是否发生变化?如果不变,请直接写出这个定值;如果变化,请直接写出该四边形面积的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/b964d5a4-8567-4330-a3ac-f536dee88577.png?resizew=483)
(1)猜想:如图①,当a=b时,写出线段AE与线段AF的数量关系;
(2)证明:如图②,连接AC,若a+b=6,请证明△ABE≌△ACF;
(3)应用:在(2)的条件下,四边形AECF的面积是否发生变化?如果不变,请直接写出这个定值;如果变化,请直接写出该四边形面积的最大值.
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,D是边
上一点,
,过点D作
于E,过点C作
于F.
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78002bca853929365a3f58082f3e7637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图1,C为线段
上一点,分别以
,
为底,在
的同侧作等腰
和等腰
且
.在线段
上取一点F,使得
,连接
,
.
;
(2)如图2,延长
交
于点G,若G是
的中点,且
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cc374bd283f92124b6303bea10c3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7f27111303c38eaf43bf547e460a33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebade77de163fb5af3efdca25d59b3d.png)
(2)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,△ABC 中,AB=AC,以 AB 为直径的⊙O 与 BC 相交于点 D, 与 CA 的延长线相交于点 E,过点 D 作 DF⊥AC 于点 F.
![](https://img.xkw.com/dksih/QBM/2020/4/2/2432975290376192/2433088939679744/STEM/94b500cba143424cafe45c45a2238475.png?resizew=251)
(1)试说明 DF 是⊙O 的切线;
(2)①当∠C= °时,四边形 AODF 为矩形;
②当 tanC= 时,AC=3AE.
![](https://img.xkw.com/dksih/QBM/2020/4/2/2432975290376192/2433088939679744/STEM/94b500cba143424cafe45c45a2238475.png?resizew=251)
(1)试说明 DF 是⊙O 的切线;
(2)①当∠C= °时,四边形 AODF 为矩形;
②当 tanC= 时,AC=3AE.
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】已知:
内接于
,过点
作
的切线,交线段
的延长线于点
,连接
,
.
(1)如图
,求证:
为
的直径;
(2)如图
,弦
,垂足为点
,弦
,求证:
;
(3)如图
,在(2)的条件下,连接
交线段
于点
,且
,若
的面积为
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4163013ce2054e7deaa65ff70561b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/23/fbe7dcf9-4091-4cf4-82aa-b3468738ee8c.png?resizew=573)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c288f7eeedffeca580dc051ba52c3768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/849233bdb50e7e0d304a9a018a664b2f.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b6a1c2e3ddd72d93483a3957bae73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c768dedaea22607617398ce28a02dd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a33d27a9c655d01f606e9bce02b0a5.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,点D为⊙O上一点,点C在直径AB的延长线上,且∠CDB=∠CAD,过点A作⊙O的切线,交CD的延长线于点E.
![](https://img.xkw.com/dksih/QBM/2020/1/15/2377427284451328/2378196631461889/STEM/f86f1c038e4347d8b735f6b87c4e3198.png?resizew=206)
(1)判定直线CD与⊙O的位置关系,并说明你的理由;
(2)若CB=4,CD=8,①求圆的半径.②求ED的长.
![](https://img.xkw.com/dksih/QBM/2020/1/15/2377427284451328/2378196631461889/STEM/f86f1c038e4347d8b735f6b87c4e3198.png?resizew=206)
(1)判定直线CD与⊙O的位置关系,并说明你的理由;
(2)若CB=4,CD=8,①求圆的半径.②求ED的长.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,
为
的切线,
为切点,过
作
,垂足为C,交
于点B,延长
与
的延长线交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/cbe74b04-ec45-477e-9b55-979df1e630d4.png?resizew=119)
(1)求证:
为
的切线;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef9abe2c6ef0ea16d6ca91e0e4e020e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/cbe74b04-ec45-477e-9b55-979df1e630d4.png?resizew=119)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b749bbf59472f47485d8fdd535dea3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次